Glenn Frey, a founding member and longtime guitarist of the Eagles, has passed away at the age of 67. 

"Glenn fought a courageous battle for the past several weeks but, sadly, succumbed to complications from Rheumatoid Arthritis, Acute Ulcerative Colitis and Pneumonia," reads a statement on the band's website. "Words can neither describe our sorrow, nor our love and respect for all that he has given to us, his family, the music community & millions of fans worldwide."

The Eagles formed in 1971 with Frey, drummer Don Henley, guitarist Bernie Leadon and bassist Randy Meisner. They would later become one of the biggest-selling artists of all time, thanks in part to the group's monster Greatest Hits 1971-1975 compilation. Frey later forged a successful solo career, with hits like "The Heat Is On" and "You Belong To The City."

Henley issued the following statement, via Billboard:

"He was like a brother to me; we were family, and like most families, there was some dysfunction. But, the bond we forged 45 years ago was never broken, even during the 14 years that the Eagles were dissolved. We were two young men who made the pilgrimage to Los Angeles with the same dream: to make our mark in the music industry -- and with perseverance, a deep love of music, our alliance with other great musicians and our manager, Irving Azoff, we built something that has lasted longer than anyone could have dreamed. But, Glenn was the one who started it all. He was the spark plug, the man with the plan. He had an encyclopedic knowledge of popular music and a work ethic that wouldn't quit. He was funny, bullheaded, mercurial, generous, deeply talented and driven. He loved is wife and kids more than anything. We are all in a state of shock, disbelief and profound sorrow. We brought our two-year 'History of the Eagles Tour' to a triumphant close at the end of July and now he is gone. I'm not sure I believe in fate, but I know that crossing paths with Glenn Lewis Frey in 1970 changed my life forever, and it eventually had an impact on the lives of millions of other people all over the planet. It will be very strange going forward in a world without him in it. But, I will be grateful, every day, that he was in my life. Rest in peace, my brother. You did what you set out to do, and then some."